Attachment-plug for electric wires.



W. G. TREGONING.

ATTACHMENT PLUG FOR ELECTRIC WIRES.

APPLICATION FILED NOV. 18, 1909. 1,005, 1 1 9.

Patented Oct. 3, 1911.

INVEHTOR ATTYS. I

BY FM/PW UNITED STATES PATENT canton; .7

WILLIAM C. TREGONING, F CLEVELAND, OHIO, ASSIGNOR TO THE TREGONLNG ELEC 'TRIC MANUFACTURING 00., 0F CLEVELAND, OHIO, A CORPORATION.

Specification of Letters Patent.

ATTACHMENT-PLUG FOR ELECTRIC WIRES Application filed November 18, 1909. Serial No. 528,675.

i To all whom it may concern:

Be it known that I, W'ILLI M' C. TRn-coN- ING, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Attachment-Plugs for Electric VVi'res, of which the following is a specification.

My invention relates to attachment plugs for electric wires, and the invention consists in a plug constructed substantially as shown and described and adapted to relieve the terminal connections of the wires from strain in case of tension on the wires which would otherwise pull. the wires out of their fastenings and whereby the strain is taken entirely off said fastenings and transferred to fixed portions of the attachment where there is strength to withstand the strain.

In the accompanying drawings, Figure 1' is a side elevation of the plug complete with the wires therein. Figs. 2 and 3 are sectional elevations of the plug on different lines respectively and showing the special manner in or by which the respective wires of the strand are pinched or gripped between the members of the plug. Fig. 4 is a central sectional elevation of the plug on the line of the screw locking said members together and showing the two wires separately locked therein. Fig. 5 is asectional elevation of the threaded shell of the plug, and Fig. 6 is a detail of the upper'or inner member of the plug. Fig. 7 is a plan View of the lower member of the plug and Fig. 8 is a bottom view of the upper member. Fig. 9 is an end View of the threaded shell of the plug.

The foregoing views represent an attachment plug for electric wires, and belongs to the style or variety of plugs which are provided with threaded or equivalent connections adapted to screw into sockets provided therefor but not shown herein. The screw shell S shown in several of the views serves as such connecting member for the plug and also a conducting medium for thecurrent from the seat 2 therein for terminal binding screw 3, and said shell is mechanically engaged at its edge between annular ofisets or shoulders about the outside of the respective members A and B of the plug as plainly:

seen in several figures. A single screw 4 secures all the said after described.

Now..in o der that any null or strain on parts together, as herein- Patented Oct. 3, 1911;.

ate terminal connections Within the plug'I employ a special but simple construction of separable. plug members asrepresented in and by the parts A and B. These members or 'parts may be made of any suitable nonconducting material and are constituted to engage or clamp the wires a and 6 contained in cable C between them in such waythatthe said wires shall be bent and firmly gripped and held :thereby regardless of other fastenings at their terminal ends beneath the heads of binding screws 3 and 4. Thus, the said member A, which is also regarded as the base of the plug, is provided with a central opening e for the introduction of cable G and with forked openings, passages or bores 6' and 7 extending therefrom and adapted toreceive the separate wires (6 and b. These forked or divided bores or openings extend through the said'member upon opposite sides of the central rib or tongue 0, and the said rib has beveled or inclined sides and is adapted to match a corresponding groove or channel 03 located in the meeting face of member B. This groove or channel has about the same depth as said rib. lug or projection c and in this'instance is like wise beveled at its sides and adapted to work with said rib torot-ate said members slightly" in the operation of gripping and bending the said wires a and b. Member B also has openings 8 and 9 respectively through the same for said wires and said openings are on opposite sides of channeld and disposed at an angle to the sides thereof of approximately forty five degrees more or less and out of alinement with or offset from the holes or passages 6 and 7 in member A relatively about as shown, thus causing a shoulder or abrupt bend to be made in the Wires at their passage from the 'holes 6 and 7 "to the holes 8 and 9 and through Whichsaid 'wires 'mustbe threaded to make connection with or at binding screws 3 and 4. To this end the holes or bores 6 and 7 are placed directly opposite each'other'on opposite sides of rib or 111 c and at right an les thereto while the holes 8 and 9 are 0 set therefrom substantially as shown so as to deflect or for-ma bend in the wire in the ,space'between members A and andthus facilitate the gripping effect. Th s also pro-- duces something of a torslonal efiectqro:

tarily between said members when tightened together by screw .4. because the beveled tongue and groove construction tends to 1'0 tate said members in respect to one another -which movement manifests itself where the w res pass from one set ofholes to the other to makemore or less of a right angled bend in the wires, as seen in Figs. 2 and 3. Thus,

- a and '6 through the same, the rib c and,

assuming'tha-tthe wire members A and B have been related so as to thread the wires .i'ehannel d obviouslywill be slightlyout of 'alinement. Then as the member .B is rotated to seat said matching portions of and (Z one within theother the wires (1 and b are necessarily bentto bring about such change, and

this occurs at the time alinement is eiiected but; before the screwt is fully tightened.

Then as the said screw is turned the beveled sides on sa d rib and groove come into action and the edges of said parts A and B about, said bores pinch 'and..'bend the said..-

wires more or lesstightly according as the said parts are drawn together. This pinch:

ing or. ipping of the'wires is designed to.

be so e ective that the wires will be immov- 1 placement.

, place rjcomplish the object I have in view without" resorting to supplemental devices which are subject to disarrangement or accldental dls- It willbe observed that the central screw 4, which is also described as a binding screw, is intended also as a clamping screw for the two parts A and B and passes centrally through part B into engagement with nut 14 in art A. This nut is usually sealed in by suitable insulating material, such "as wax or a compound. V.

" The openingor passage 8 for wire a is of the nature of an open groove or channel in the side-of member 13 so as to make a slip connection at that point with inturned lip 2 of shell S available Inturnedlip 2 when I in place within passage 8 holds shell S fromrotating independently of member B, and the rib or lug c and channel Z prevent independent rotation of members A and B when the said parts are fully clamped together. [Obviously said rib cand channel (Z 1 might'be .reversed as to theparts N'and-B and be the equivalent or the present arrangement' and other changes might be made in' the details of the device such as dispensing I with the beveled s'des ofthe rib and groove without departing from tlie spirit and essence of the invention. Thus also the so- 60 called rib, tongue or projection on member A need not necessarily exten'd entirely across the face of said member but the present construction is preferred,nor is it absolutely necessary to offset the wire openings 1n the exact measure as shown. Fig. 4 especially .one edge to provide a shows wire Z) as being bound by end contact cup or disk 10 and screw 4, while wire a is boundby screw 3 on the struck-up seating portion 2 therefor in shell S. This portion 2 1s struckup out of the side of shell S and bent at right angles thereto to provide a depressed seat for screw 4 below the plane of the upper end edge of'theshell, thereby forming a pocket for the head of binding screw 3 and the terminal ends of wire a.

Member A is' preferably larger in diameter 1n part than member B to permit gripping by the hand in screwing the plug into a lamp or other socket. The threaded portions of shell S must also necessarily be of greater diameter than member B to permit ts introduction into the socket.

What I claim is:

1. An attachmcntplug for electric wires comprising two members adapted to be clamped together, one of said members having a beveled tongue and the other agroove to receivesaid tongue and provided with bores on opposite sides of said tongue and groove respectively out of alinement as between said members, a screw uniting said members and a socket engaging shell about .ing two separable members, each having openings therein ,forthe terminal wires, :1 current conducting screw shell, means to partially rotate said members in respect to one another to b nd the wires when said parts are clampe together, and a screw to detachably clamp" aid parts together.

4. An electrical attachment plug comprising two members having interlocking por- 'tions and provided with openings for the electric wires, a current conveying screw shell having an inturned portion to form a terminal connection for one of said wires, and one of said members having a. side channel to confine and hold said inturned portion and therethrough prevent independent rotaclamp said parts together.

5."In electrical attaclimentplugs, a current conducting screw shell having an inturnedportion struck"up from its side at pocketand seat for a terminal connection.

'6. An electrical attachment plug comprising separable members having peripheral ofi'sets, a current conducting screw shell sleeved upon and secured between said members by said offsets and having an inturned portion struck up from the side thereof at lit one edge to provide a pocket and seat for a terminal connection, and a current conveying clamping screw to detachably secure said parts together.

7. An electrical attachment plug compris ingr two members of insulating material havg ing interlocking meeting faces and provided withannular shoulders externally, a current conveying screw shell secured between said members by said annular shoulders and having an inturned portion to provide a terminal connect-ion, an end cont-act disk and a terminal binding and'clamping screw centrally of saidmembers to detachably secure said parts t ether, and said members hav ing opposite y disposed openings therein, but out of alinement in respect to each other to provide binding shoulders at said meetin faces, whereby the wires are bent and gripped between said members to relieve pulling strains on the terminal connections within said plug.

8. An attachment plug for electric wires comprising two cylindrical members having their respective meeting faces constructed with interlocking means to cause a small relative rotation when the members are.

drawn together, one of said members having a longitudinal groove and bore therein and the other member having a forked opening therethrou h in ofiset radial relation to said [groove an bore in said first member, and

means to draw said members together.

9. An attachment plug for electric wires provided with an outer screw shell adapted to make socket connection and two members having fiat end faces mounted oppositely adapted to interlock rotarily and each of said members having openings through the same out of alinement with each other and providing overlapping grippin edges in close seating relation at the meeting faces of said members, electric wires through said openings having their terminals fixed in one of said members and means to draw said members together longitudinally to bend and pinch the wires between said overlapping edges and relieve their terminals of possible strain. In testimony whereof I afiix my signature in presenceof two witnesses.

' WVILLIAM C. TREGONING. Witnesses:

E. M. FIsHnR, F. C. MUSSUN.

and provided with opposed beveled portions"- 

